A blog is that is all about mathematics and calculators, two of my passions in life.

Thursday, May 28, 2015

HP Prime, TI-84 Plus, Casio Prizm: Julian Day Shortcut Formulas

Julian Day Shortcut FormulasHere are a couple of formulas that can be used to quickly get the Julian Day. (I haven't figured how to include the time yet).HP Prime (Rev. 7820):yyyy: four digit year, mm: two digit month, dd: two digit day. The international date format is used.From December 31, 1899:JD = DDAYS(1899.1231,yyyy.mmdd) + 2415020Alternatively, from November 16, 1858:JD = DDAYS(1858.1116, yyyy.mmdd) + 2.4E6TI-84 (and BA II Plus to that extent):Dates are good from January 1, 1950 to December 31, 2049:JD = dbd(1.0150, mm.ddyy) + 2433283The days between dates function (dbd) is accessed by pressing [ APPS ], [ 1 ], [ALPHA], [ x^-1] (D). Casio Prizm and fx-Graphing calculators:Dates are good from January 1, 1901 to December 31, 2099:JD = Days_Prd(1,1,1901,mm,dd,yyyy) + 2415386Where to find Days_Prd: [ OPTN ], ( > ) (until you see the FINANCE sub menu), (FINANCE), ( > ), (DAYS), (PRD)Hope you find this helpful.Source:"Julian Day" http://en.wikipedia.org/wiki/Julian_day Retrieved May 28, 2015EddieThis blog is property of Edward Shore. 2015.